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- // Copyright 2020 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- // +build darwin dragonfly freebsd netbsd openbsd
- // BSD library calls.
- package syscall
- import (
- "unsafe"
- )
- //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)
- //sysctl(mib *_C_int, miblen uintptr, old *byte, oldlen *uintptr, new *byte, newlen uintptr) _C_int
- //sysnb raw_ptrace(request int, pid int, addr uintptr, data uintptr) (err Errno)
- //ptrace(request _C_int, pid Pid_t, addr *byte, data _C_int) _C_int
- //sys paccept(fd int, rsa *RawSockaddrAny, addrlen *Socklen_t, sigmask *_sigset_t, flags int) (nfd int, err error)
- //paccept(s _C_int, rsa *RawSockaddrAny, addrlen *Socklen_t, sigmask *_sigset_t, flags int) _C_int
- //sys Flock(fd int, how int) (err error)
- //flock(fd _C_int, how _C_int) _C_int
- func ReadDirent(fd int, buf []byte) (n int, err error) {
- // Final argument is (basep *uintptr) and the syscall doesn't take nil.
- // 64 bits should be enough. (32 bits isn't even on 386). Since the
- // actual system call is getdirentries64, 64 is a good guess.
- // TODO(rsc): Can we use a single global basep for all calls?
- var base = (*uintptr)(unsafe.Pointer(new(uint64)))
- return Getdirentries(fd, buf, base)
- }
- func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {
- var rsa RawSockaddrAny
- var len Socklen_t = SizeofSockaddrAny
- nfd, err = paccept(fd, &rsa, &len, nil, flags)
- if err != nil {
- return
- }
- if len > SizeofSockaddrAny {
- panic("RawSockaddrAny too small")
- }
- sa, err = anyToSockaddr(&rsa)
- if err != nil {
- Close(nfd)
- nfd = 0
- }
- return
- }
- //sysnb pipe2(p *[2]_C_int, flags int) (err error)
- //pipe2(p *[2]_C_int, flags _C_int) _C_int
- func Pipe2(p []int, flags int) (err error) {
- if len(p) != 2 {
- return EINVAL
- }
- var pp [2]_C_int
- err = pipe2(&pp, flags)
- p[0] = int(pp[0])
- p[1] = int(pp[1])
- return
- }
- func Sysctl(name string) (value string, err error) {
- // Translate name to mib number.
- mib, err := nametomib(name)
- if err != nil {
- return "", err
- }
- // Find size.
- n := uintptr(0)
- if err = sysctl(mib, nil, &n, nil, 0); err != nil {
- return "", err
- }
- if n == 0 {
- return "", nil
- }
- // Read into buffer of that size.
- buf := make([]byte, n)
- if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil {
- return "", err
- }
- // Throw away terminating NUL.
- if n > 0 && buf[n-1] == '\x00' {
- n--
- }
- return string(buf[0:n]), nil
- }
- func SysctlUint32(name string) (value uint32, err error) {
- // Translate name to mib number.
- mib, err := nametomib(name)
- if err != nil {
- return 0, err
- }
- // Read into buffer of that size.
- n := uintptr(4)
- buf := make([]byte, 4)
- if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil {
- return 0, err
- }
- if n != 4 {
- return 0, EIO
- }
- return *(*uint32)(unsafe.Pointer(&buf[0])), nil
- }
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